Display Panel and Organic Light Emitting Display Device Having the Same

1. A display panel of an organic light emitting display device, the display panel including a plurality of pixel circuits, each of the pixel circuits comprising: an emission unit including an organic light emitting diode; a pixel driving unit configured to drive the emission unit based on a scan signal and a data signal; and a switch unit configured to control an electrical connection between the emission unit and the pixel driving unit based on an emission signal, a capacitance of a first parasitic capacitor coupled between the emission unit included in a first pixel circuit of the pixel circuits and the pixel driving unit included in the first pixel circuit being smaller than a capacitance of a second parasitic capacitor coupled between the emission unit included in the first pixel circuit and the pixel driving unit included in a second pixel circuit of the pixel circuits adjacent to the first pixel circuit, wherein the emission unit comprises: the organic light emitting diode having a first electrode coupled to the switch unit, and a second electrode coupled to a first power supply voltage; a first transistor having a gate electrode receiving the scan signal, a first electrode coupled to the first electrode of the organic light emitting diode, and a second electrode coupled to a bias voltage; and a first capacitor having a first electrode coupled to the first electrode of the organic light emitting diode, and a second electrode coupled to the second electrode of the organic light emitting diode, wherein the switch unit comprises: a second transistor having a gate electrode receiving the emission signal, a first electrode coupled to the pixel diving unit, and a second electrode coupled to the emission unit, and wherein the first capacitor stores the bias voltage when the second transistor electrically separates the emission unit from the pixel driving unit during a turn-off period of the emission signal.

2. The display panel of claim 1 , wherein a first electrode of the organic light emitting diode included in the first pixel circuit is disposed over the pixel driving unit included in the second pixel circuit, and wherein the first electrodes of the organic light emitting diodes of the emission units of the plurality of pixel circuits are disposed spaced apart from each other.

3. The display panel of claim 1 , wherein the second pixel circuit is located in a first direction from the first pixel circuit, and the first direction is opposite to a direction in which the scan signal is sequentially applied to scan lines of the plurality of pixel circuits.

4. The display panel of claim 1 , wherein the second pixel circuit is located in a second direction from the first pixel circuit, and the second direction is a direction in which the scan signal is sequentially applied to scan lines of the plurality of pixel circuits.

5. The display panel of claim 1 , wherein: the first transistor applies the bias voltage to the first electrode of the organic light emitting diode during a turn-on period of the scan signal, and the first capacitor stores the bias voltage applied to the first electrode of the organic light emitting diode during the turn-on period of the scan signal.

6. The display panel of claim 5 , wherein, when the data signal representing a black gray level is applied to the pixel driving unit during the turn-on period of the scan signal, the emission unit allows a current leaked from the pixel driving unit to flow through the first transistor during a turn-on period of the emission signal.

7. The display panel of claim 6 , wherein the bias voltage has a voltage level set for the organic light emitting diode not to emit light by the leaked current during the turn-on period of the emission signal.

8. The display panel of claim 1 , wherein the pixel driving unit comprises: a second capacitor having a first electrode coupled to a second power supply voltage, and a second electrode; a third transistor having a gate electrode coupled to the second electrode of the second capacitor, a first electrode coupled to the second power supply voltage, and the second electrode coupled to the switch unit; and a fourth transistor having a gate electrode receiving the scan signal, a first electrode receiving the data signal, and a second electrode coupled to the gate electrode of the third transistor.

9. The display panel of claim 8 , wherein: the first parasitic capacitor is a parasitic capacitor formed between the first electrode of the organic light emitting diode included in the first pixel circuit and the gate electrode of the third transistor included in the first pixel circuit, and the second parasitic capacitor is a parasitic capacitor formed between the first electrode of the organic light emitting diode included in the first pixel circuit and the gate electrode of the third transistor included in the second pixel circuit.

10. The display panel of claim 8 , wherein the fourth transistor applies the data signal to the second electrode of the second capacitor during a turn-on period of the scan signal, and the second capacitor stores the applied data signal.

11. The display panel of claim 10 , wherein the pixel driving unit comprises: a current source configured to supply an emission current, the current source having a first electrode coupled to the second power supply voltage and a second electrode, and a first electrode of the third transistor is coupled to the second electrode of the current source.

12. An organic light emitting display device, comprising: a display panel including a plurality of pixel circuits; a scan driver configured to apply a scan signal to the pixel circuits; an emission driver configured to apply an emission signal to the pixel circuits; a data driver configured to apply a data signal to the pixel circuits; and a timing controller configured to control the scan driver, the emission driver, and the data driver, each of the pixel circuits comprising: an emission unit including an organic light emitting diode; a pixel driving unit configured to drive the emission unit based on the scan signal and the data signal; and a switch unit configured to control an electrical connection between the emission unit and the pixel driving unit based on the emission signal, a capacitance of a first parasitic capacitor between the emission unit included in a first pixel circuit of the pixel circuits and the pixel driving unit included in the first pixel circuit, being smaller than a capacitance of a second parasitic capacitor between the emission unit included in the first pixel circuit and the pixel driving unit included in a second pixel circuit of the pixel circuits adjacent to the first pixel circuit, wherein the emission unit comprises: the organic light emitting diode having a first electrode coupled to the switch unit, and a second electrode coupled to a first power supply voltage; a first transistor having a gate electrode receiving the scan signal, a first electrode coupled to the first electrode of the organic light emitting diode, and a second electrode coupled to a bias voltage; and a first capacitor having a first electrode coupled to the first electrode of the organic light emitting diode, and a second electrode coupled to the second electrode of the organic light emitting diode, wherein the switch unit comprises: a second transistor having a gate electrode receiving the emission signal, a first electrode coupled to the pixel diving unit, and a second electrode coupled to the emission unit, and wherein the first capacitor stores the bias voltage when the second transistor electrically separates the emission unit from the pixel driving unit during a turn-off period of the emission signal.

13. The organic light emitting display device of claim 12 , wherein: a first electrode of the organic light emitting diode included in the first pixel circuit is disposed over the pixel driving unit included in the second pixel circuit, and the first electrodes of the organic light emitting diodes of the emission units of the plurality of pixel circuits are disposed spaced-apart from each other.